CASCACascade Atlas

Evidence dossier

CVE-2024-38475

Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.

82.7–97.7Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

Improper escaping of output in mod_rewrite in Apache HTTP Server 2.4.59 and earlier allows an attacker to map URLs to filesystem locations that are permitted to be served by the server but are not intentionally/directly reachable by any URL, resulting in code execution or source code disclosure. Substitutions in server context that use a backreferences or variables as the first segment of the substitution are affected.  Some unsafe RewiteRules will be broken by this change and the rewrite flag "UnsafePrefixStat" can be used to opt back in once ensuring the substitution is appropriately constrained.

State
PUBLISHED
Published
Jul 1, 2024
Updated
Nov 3, 2025
Evidence coverage
85%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS99.96%

2026-07-18 · v2026.06.15 · percentile 100.0%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

apacheoriginal assertion
container

Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

CISA KEVoriginal assertion
observed_exploitation

Apache HTTP Server Improper Escaping of Output Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.999570000000; percentile 0.999750000000

Applicability

Cited product scope

Trace impact →
apachehttp_server
[{"status": "affected", "version": "2.4.0", "versionType": "custom", "lessThanOrEqual": "2.4.59"}]unknown
Apache Software FoundationApache HTTP Server
[{"status": "affected", "version": "2.4.0", "versionType": "semver", "lessThanOrEqual": "2.4.59"}]unknown
netappontap_9
[{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*; start including 2.4.0; end excluding 2.4.60supported
Unknown vendorUnknown product
cpe:2.3:a:netapp:ontap_9:-:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:h:sonicwall:sma_200:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:sonicwall:sma_210:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:sonicwall:sma_400:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:sonicwall:sma_410:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:h:sonicwall:sma_500v:-:*:*:*:*:*:*:*constrained
Unknown vendorUnknown product
cpe:2.3:o:sonicwall:sma_200_firmware:*:*:*:*:*:*:*:*; end excluding 10.2.1.14-75svsupported
Unknown vendorUnknown product
cpe:2.3:o:sonicwall:sma_210_firmware:*:*:*:*:*:*:*:*; end excluding 10.2.1.14-75svsupported
Unknown vendorUnknown product
cpe:2.3:o:sonicwall:sma_400_firmware:*:*:*:*:*:*:*:*; end excluding 10.2.1.14-75svsupported
Unknown vendorUnknown product
cpe:2.3:o:sonicwall:sma_410_firmware:*:*:*:*:*:*:*:*; end excluding 10.2.1.14-75svsupported
Unknown vendorUnknown product
cpe:2.3:o:sonicwall:sma_500v_firmware:*:*:*:*:*:*:*:*; end excluding 10.2.1.14-75svsupported

Assessments

CVSS by origin

9.1
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.1
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
9.1
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.